They are unproven at this level, and as I posted on another thread incorrectly, it should have been one of numerous others, wait until the summer an get the right person in.
Having someone-anyone- on trial, suggests the faith in them to do the jopb in the first place isn't there and that could be very dangerous.
Thinking about it perhaps someone like Graham Drury who did well at Corby and is now doing a decent job at Stamford could be a summer consideration?